Table 9.2 Average Returns for Bonds

		Long-Term Treasury Bonds
1950 to 1959	Average		0.0	%
1960 to 1969	Average		1.5
1970 to 1979	Average		5.9
1980 to 1989	Average		13.1
1990 to 1999	Average		9.5
2000 to 2009	Average		8.8

Table 9.4 Annual Standard Deviation for Bonds

	Long-Term Treasury Bonds
1950 to 1959		4.7	%
1960 to 1969		6.3
1970 to 1979		6.9
1980 to 1989		15.1
1990 to 1999		12.9
2000 to 2009		10.9

Use the tables above to calculate the coefficient of variation of the risk-return relationship of the bond market during each decade since 1950.